A320:Thrust lever management incase of Inop Reversers

[320p]

Hi,

FCTM AO-020 P 15/22 recommendations on thrust levers management applicable in case of in-flight failure (including engine ailure) and/or in case of MEL dispatch with reverser(s) deactivated for NO REVERSERS OPERATIVE states:

If no reversers are operative, the general recommendation is to not select the reverser thrust during RTO and at landing.However, the PF still sets both thrust levers to the IDLE detent, as per normal procedures.

Any specific reason for this recommendation and what are the consequences of taking both thrust levers to Max Rev or Idle Rev detent in this case?
For G+Y system failure or Electrical Emegency Cofig ,on landing should we take Thrust lever only to idle postion?

Thanks.